Slide projector



C. H. WIKLUND SLIDE PROJ'EGTOR Jan. 11, 1966 13 Sheets-Sheet 2 Fi1ed March 17. 1961 a T. m m

Jan. 11, 1966 c. H. WIKLUND 3;22s132 SLIDE PROJEC'IOR Filed March 17, 1961 13 Sheets-Sheet 5 INVENTOR. CAQL H. MKLUNO Jan. 11, 1966 c: H. wn x.uma

SLIDE PROJEC TOR 15 Shets-Sheet 4 Filed March l'7. 1961 C. H. WIKLUND SLIDE PROJEGTOR Jan. 11, 1966 15 Sheets-Sheet 5 Filed March 17, 1961 IN V EN TOR. C494 Mr z.un/D

C. H. WIKLUND SLIDE PROJECTOR Jan. 11, 1966 13 Sheets-Sheet 6 Filed Maroh 17, 1961 INVE'N TOR.

CAAPI IQ/IKLUND C. H. WIKLUND SLIDE PROJECI'OR Jan. I1, 1966 13 Sheecs-Sheet 7 Filed March 17, 1961 Jah. 11, 1966 c. H. WIKLUND 39 SLIDE FROJECTOR Filed March l7, 1961 15 Sheets-Shaet 9 Fan. H, 1966 b c. H. WIKLUND 9 2 SLIDE PROJECTOR Filed March 17, 1961 15 S e 10 c. H. WIKLUND 3,228132 SLIDE PROJEC'IOR Jan. 11, 1966 13 Sheets-Shaec 11 Filed March 17, 1961 INVEN TOR. C4 4 H. l /u awv0 c. H. WIKLUND SLIDE PROJEC'IQR Jan. 11, 1966 13 Sheets-heet 12 INVENTOR. C494. H- MKLUND Filed March 17, 1961 C. H. WIKLUND Jan. 11, 1966 SLIDE PROJECTOR 13 Sheets- Sheet 15 Filed March 17. 1961 A o /vc'y 3,228l32 SLIDE PROJECTOR Carl H. Wiklund, New Rochelle, N.Y., assignor, by mesne assignments, t Airequipt Inc. New Rochelle, N.Y., a corporation 0f New York Filed Mm. 17, 1961, Sex. N0. 96,429 4 Claims. (Cl. 40-79) Tl1e present invention relates to slide projectors and more particularly an improved autmatic magazine type slide projector Willi remote control of the slide changing and the projector focusing.

The present projector incorporates improved automatic slide changing will: remote control in a simplilied, novel, and compact arrangernent which makes the benefits of both automatic and remote control available in a compact, light-weight and reliable slide projector. The projector of the present invention also provides for a variely cf difierent optional operating methods from local band operation to automatic rernote operation. with built-in interlocks and safety features which make such operations fool proof and simple and which project the slides and magazines. The projector also combines mechanical and electrical control systems to take advantage of lhe most desirable features of both systems for local or remote opcration.

Accordingly, an object of the present invention is t0 provide an automat-ic slide projector adapted f0r remote contml.

Anolher object of the present invention is to provide a compact automatic electro-mechanical slide projector.

Another object of the present invention is to provide an improved remotely controlled slide projeclor.

Another object of the present invention is to provide an improved automatic slide changer with remotely coulrolled slicie changing and focusing.

Another object 0f -the present invention is to provide an automatic magazine-type slide projector with forward ancl reverse magazine movement.

Other and further objects of the invention will be obvious upon an understanding cf the illustrative embodiment about to be clescribed, er will be ind-icated in the appended claims, and various advantages n-ot referred t0 herein will occur 10 one skilled in the art upon employment 0f the invention in practice.

A preferred embodiment cf the invention has been chosen forpurposes of illustration and description and is shown in the accompanying drawings, forming a part of the specification, wherein:

FIG. 1 is a perspective view of Ihe projeotor according to the present invention showing the covers in place;

FIG. 2 is a fragmentary perspective view of the projector in operating position;

FIG. 3 is a bottom plan view of the projector withlhe bottom plate removed;

FIG. 4 is an enlarged perspective view of the shutter housing and the optical system;

FIGS. 5-10 are perspective views of the shutter housin g details;

FIGS. 1114 nre perspective views of the slide editor on lhe shutter housing;

FIG. 15 is a perspective view of the slide editor interlock for t-he slide injection lever;

FIGS. 16 and 17 are perspective views showing the operation of the slide edit-or slide-engaging latch;

FIG. 18 is a bottom perspective vicw of the projector chassis showing the focusing and projector elevating means;

FIG. 19 is a detailed side elevati-onal view of the lens carriage mounting;

FIG. 20 is a perspective view of the remote focusing means;

Patented Jan.- 11, 1966 FIGS. 21 and 22 are side elevational views of the remote focusing ratchet;

FIG. 23 is a perspective view illustrating the remote focusing pawl return spring;

FIGS. 24 ancl 25 are perspective views of the remotely operated slide changing solenoid and latch;

FIG. 26 is a diagrarnmatic View of the remote slide changing system;

FIG. 27 is a bottom plan view of the reversible magnzine stepping means;

FIG. 28 is a sectional view -along line 28-28 of FIG. 27;

FIGS. 29-34 are plan views of the magazine indexing means showing the operatiori cf the reversible .magazine stepping means;

FIG. is an exploded perspective view of 1he sliding lever and the slide injector lever;

FIG. 36 is an exploded perspective view of the slide injection lever guide block and 1he magazine indexing gcar;

FIG. 37 is an exploded perspective 0f the projector lens and lens mounting;

FIG. 38 is a fragmentary perspective view cf the projector illustrating the automatic lens cover;

FIG. 39 is a perspective view 0f the projector leveling means; and

FIGS. 40 and 41 are pefspectlVe views cf the coupling means in the slide changing mechanism.

G cneml descrz'ption The -projector willfirst 'be described generally with particular reference to FIGS. l, 2, and 4.

The projector 1 has an integral housing and case coustruction comprising an enclosed base 2 with a permanent hous'ing 4 covering the light source und oplical sys tem and a cover 5 removably mt untcd adjaccnl to housing 4 to enclose the slide magagine mounting platz; 6 and the projector controls. A carrying handle 8 is slidzrbly m0unted on the housing 4 and is illustrated in FIG. 1 in its upward or carrying position am! in FIG. 2 in ils lowered position.

The projector 1 is adapted to successively show slides stored in a magazine 9. In the preferred embodiment, each magainze 9 is provided with a plurality of slide holding frames 10 and one slide 11 is inserted in each 0f ihe frames 10. A reciprocating slide injeclion lever 7 suocessively moves the frames 10 fr-0m Ihe magazine 9- 't0 -the shufler housing 13 (FIG. 4) where each slide 11 is exposecl to be projector optical system for projection onto a suitable scrcen. The projector optical syslem, mounted on base 2, includes a lamp 14 and lenses 15 and reflector 16 positioned in a frame member 17. The beam of light from lamp 14 passes -through lenses 15 and the slidc 11 in shutter housing 13 for projection by lens systern 18. The lens system 18 is adjustably mounled an base 2 for both direct and remote fiocusing as will be more fully described below.

The slide framcs 10 are moved between the magazine 9 and the shulter housing 13 by the slide injection lever 7. A hook 19 (FIG. 35) in the inner end 0f the slide injection lever 7 engnges a cooperating recess 20 in eaCh frame 10 to control the movement of the frame 10 to and from the shutter housing 13. The slide injection lever 7 is a-tiached by handle 23 to a sliding ]ever 12 slidably mounted on the base 2 and an upstanding pusller arm 24 is mounted 0n the end of the sliding lever 12 to insure the return 0f each frg1me 10 into the magazine 9. The hook 19 is yieldably mounted in the end of the slide injection lever 7 f-or vertical movement and a cum surface 21 (FIG. 36) on guide block 22 raises the hook 19 astl1e 19 from recess 20. After the disengagement "of hook 19 from the frame 10 the pusher arm 24 moves the frame further int the magazine. Cam surfaces, 3 on the sidewalls of -hou'sing 4 completes the return 01: the frames by nudging the frames completely into magazine 9 as the magazine moves 0n plate 6.

A slide changing cycle starts with the slide'injection lever 7 moved iriwardly -through the magazine 9 with a frame 10 positioned in projection position in the shutter houslng 13 on the hook 19. A slide changing-cycle cousists cf the return of the frame 10 to the magazine 9, the stepping forward of the magazine 9 to present the next successive frame 10 to the slide injection lever 7 and the engagement of this frame 10 by the slide injection lever 7 and its movement into the s-hut-ter housing 13 for projection. As will -be deseribed below the chan'ging cycle may be controlled lo'cally at the projector orfrom a remote position. If necessary the projector may also be focused from the Same remote position. As will be also described below a separate oonvenient access means is provided for the slide in the shutterhousing 10 simplify slide changing or editing.

Slide changz'ng The mechanism for moving the slide injection lever 7 through this cycle Willfirst be des'cribed with particular reference 10 FIG. 3. A drive motor 25 having a.drive pulley 26 is mounted on the base 2. The drive motor 25 runs continuously when the projector is plugged in for useto provide for a continuous r-ocking movement of an operating disc 27 on shaft 28 through the intermediation 01 pulley 26, belt 29, pulley 30, pulley pinion 31 (FIG. 18), drive gear 32 and connecting rod 33. The operating disc 27 is removably coupled 10 the sliding lever 12 and the slide injection lever 7 which move as a unit by the coupling means illustrated generally at 34 which is similar to the coupling rneans described fully in my Patent N0. 2915840. T-his coupling means will be described herein in a sufiicientdegree to facilitate the description 015 the remote control means fdr changing the slides from a remote operating position.

The coupling means 34 is operated by either remote 01' local controls to change the slides. As descrlbed above, the operatin g disc 27 is continuously rocked er oscillated on the shaft 28 by its connection to drive motor 25. The coupling means 34 provides a detachable connection between the oscillating operating disc 27 and the sliding lever 12 which reciprocates the slide injection lever 7 to change the slides 11.

The eoupling means 34 illustrated in FIGS. 40 and 41, eomprises an engagement hook 40 pivotally attached at 43 to an engagement lever 39 and positioned to engage as seen in FIG. 40, with the engagernent hook 40 seated an engagernent cam release 48 whi-ch is also mounted 011 sh-aft 28.

In the first or engaged position of engagement cam 46, as seen in FIG. 40, the cam surface 45 and cam follower arm 44 hav been moved inwardly toward shaft 28 by a spring 49 so that the engagernent hook 40 engages the slot 41 in the operating disc 27. In its second or disengaged position, as seen in FIG. 41, the cam surin the slot 41, the operating disc 27 and the engagement lever 39 move in synchronism and the rocking molion of -the engagement lever 39 is lrcmslated into a reciprocaling movement of sliding lever*12 through link 38 (FIG. 18). This moves the"slide inje-ction lever 7 through a slide changing cycle' thereby moving one slide 11 out of the viewing position and another one into vtheviewing Position for one rotation o f the drlve gear 32. When the enga'gement cam 46 1s in its disengaged position, as seen in FIG. 41, the slide transfer lever is disconnccted and stationary with a slide 11 in the viewing position in shutter hm1sing 13.

The engagement cam 46 is moved between its engaged and -its disex'lgaged positions by the engagement cam release 48, which is c-ontrolled by the operator through manually operated control button 37 or a remote control as will now be descri-bed.

The engagement cam release 48 is rotatably mounted on the slraft 28 immediately adjacent to the engagement cam 46 with a cam roller 55 on the engagernent cam release 48 e'ngaging a cam slot 56 in the engagement cam 46. The engagement cam release 48 and the engagement cam 46 as'well as the other rotatable members on shaft 28 are separated for independent movement by suitable washers. With the hookedend portion 57 of the engagement cam 46 preventing rotational m0vernent of the en- "gagement cam 46 about shaf-t 28 by its striking arm 44,

-the counter-clockwise rotation cf an arm 58 of engagement cam release 48 from the engaged position as seen in FIG. 40 t0 the disengaged position as seen in FIG. 41 moves r0ller 55 from the radially outward end 159 cf slot 56 to the radially inward end 60, causing the engagement cam 46 t0 move in slot 47 on shaft 28 so that cam surfaoe 45 cf the engagement cam 46 moves autward-ly from shaft 28, thereby lifting the engagement cam follower 42 and removing the engagement hook 40 from slot 41.

The engagement cam release 48 is'urged towards its engaged position, as seen in FIG. 40, bya spring 62 counected to the outer end 01: arm 58 on the engagement cam release 48. When the engagement cam release 48 is inthis position, the engagement hook 40 engages the slot 41 in operating disc 27, causing the engagement lever 39 to rock with the operating disc 27. As the engagement lever 39 moves in a counter-clockwise direction arm 44 on the engagement cam follower 42 strikes the arm 58 of the engagement cam release 48 and moves the engagement cam release 48 to its disengaged position, as seen in FIG. 41. When the engagement cam rele'ase 48 reaches this position, the release lock 36 engages the extension 63 on the engagement cam release 48 and holds it in its disengaged position. As the engagemeht lever 39 co'ntinues on its cycle and is carried in a clorzkwise direction by the operating disc 27 back to the starting position the engagement cam 46 lifts the engagement cam follower 42, releasing the engagement hook 40 from the slot 41. The operating disc 27 will now oscillate independently of the engagement lever 39 so that the slide 11 which has been moved into the shutter housing 13 by the clockwise m0- tion 013 the engagement lever 39 will rernain in its viewing position until therelease lock 36 is opcrated, as will be v explained below, to free the engagement cam release 48 to initiate anothercycle.

The release lock 36 has a U shaped cross section (FIGS. 24 and 26) and it is pivotzflly mounted by pinions 70 which are swingably mounted in relense lock brackct 71.

A release lock conlrol button 37 (FIG. 26) controls the positlon of the release lock 36 through the intermediation of release lock shaft 74.

The release lock shaft 74 normally holds the release lock 36 in its engaged posilion with the engagemcnt cam release 48 under the force ofsprings 69 and 75 which hold shaft' 74 and button 37 in lheir upward positions.

Shaft 74 is moved downwardly by button 37 swing the release lock 36 clear of thc engagement cum release 48 to change a slide. The release lock 36 is connectcd to the shaft 74 by biflg engaged between flange 76 and spring 77. When the release lock 36 rcaches its slid6' changing position against stop 78, further depression of the button 37 and the shaft 74 causes a comprcssion of the spring 77 and a closing of a reversing switch 79. Reversing swilch 79 operates a magazine reversing means as will be more fully explained below. Thus, depression of the button 37 about half-way down against springs 69 and initiates a regular slide changing action 10 change slides so tnat the next successive slide in the magazine is projected. Fnrther depression of button 37 against the added force of spring 77 closes reversing switch 79 to change slides by reprojecting the preceding slide in the magazine.

A slide changing control is also provided for remote operaiion by the system illustrated in FIG. 26. The armature 80 of a solenoid 81 is mechanically coupled to the release lock 36 by a lever 82 (FIG. 24). Tbe solcnoid 81 is Coupled to a remotely located control switch 83 mounted in a remote control handle 84 (FIG. 2). The switch 83 is coupled 10 the solenoid 81 by wires 85 and 86 tnrough a voltage source 87. The switch 83 has a first Set of contacts 88 which are closed by the initinl downward movement of control button 89 to energize the solenoid 81 to opcn release lock 36. An additional contact 90 is provided und is mounted in parallel with the above described reversing switch 79 to provide for re verse movement of the magazinc 9 in the slicle changing action.

A regular forward slide changing cyclc is thus initiatcd by applying an initial downward pressure on either control button 37 or on the button 89 in rernote handle 84. Additional downward pressure on either button closes the reversing switch at either location 10 provide a reversc change. The operator is able to distinguish between the forward and reverse action since a relatively light pressure on batton 37 compresses springs 69 and 75 for a forward change and an additional noticeably heavier pressure is required to compress reverse spring 77. Similarly, button 89 on remote handle 84 is easily pushed down for a forward change by bending the single spring leaf to close contacts 88 while a noticeably greater pressure is required to close contact 90 by bending an additional leaf spring.

In the preferred embodiment of the projector, an adjustable timer is inclucled in the Coupling means 34 which activates the release lock 36 at adjustably controlled time r intervals to provide for completely aulomatic slide changing. A preferred form of such a timer is disclosed in my Patent Number 29l5840 Magazine indexing The slide magazines are slideably mounted on the projcctor by being placed on the magazine mounting plate 6 between a pair of spaced sich: rails. Each magazine hus a rack 91 (FIG. 27) extending along one lowcr edge which engages a magazine indexing gear 92.

The magazine indexing gear 92 advances one tootn for each slide changing cycle to advance the magazine 9 so that the next successive slide frame 10 is presented to the slicle injection lever 7. This indcxing control for the magazine indexing gear 92 is operated by the above described slide changing mechanism as illustrated in detail in FIGS. 27-34.

Bach slide changing cycle includes a reciprocating movement of tl1e sliding levcr 12 from a fully inserted position with its inner end adjacent to the shutter housing through a fully extended position with its inner encl beneath the slide magazine and a subsequent return to the fully inserted position. The magazine indexing gear is controlled by an indexing notch 93 in the end of the sliding lever 12 as illustrated in FIGS. 29-34 which cooperates with a ratchct aml pawl mcchanism which will now be described in detail.

FIGS. 29 ancl 30 'illustrate the operalion of the ratchet and pawl for a forward step of the magazine. This indexing-rneans includes a pivotaily mounled pawl control lever 94 mounted on the base adjacent to the sliding lever 12 and having a projection 95 adapted to intermittently engage thc indexing notch 93 in the sliding lever 12. When the sliding lever 12 reaches its fully extendcd position as illustrated in FIG. 29 the projection enters the indexing slot 93 in the slicling lever 12 under the force of sprin'g 96. This rocks the pawl 97 away from ratchet wheel 98. In tl1s normal operation for forward movement of the magazine 9 a pawl reversing lever 99 pivotally mounted on base 6 at 100 is kept in its upper position (FIG. 29) so that connecting spring 101 holds the lower tooth 102 on ratchet 97 acljacent ratc het wheel 98. New when the sliding lever 12 begins its return motion to move the next slidc frame 10 into viewing position, its return movement lifts projection 95 from notch93 in sliding lever 12. This rotates control lever 94 in a clockwise diiection (FIGS. 30 and 31) and moves the to0th 102 against a tooth 103 on the ratchet wheel. This turns ratchet wheel 98 and interconnected indexing gear 92 in a counterclockwise direction to advance the magazine 9 to present the next slide frame 10 to advancing injection lever 7.

The reverso Operation of the. indexing mechanism is illustrated in FIGS. 26 and 27 and 31-34.

The reversc movement of the indexing mechanism to return tho mngazine so (hat the previously shown slide is projected instead of the next successive slidc is comtrollecl by reversing lever 99. Lever 99 is drawn downwardly by solenoicl 104 and connecting arm 105 (FIGS. 27 and 31) for the reverse operalion. The indexing action with the reversing lever 99 in its reverse position is illustrated in FIGS. 3234.

When the siiding lever 12 moves outwardly as illustrated in FIGS. 32 and 33 to the position where slide injection lever 7 is clear of the magazine 9 as illustrated in FIGQ2, projection 95 again moves into slot 93. With the reversing lever 99 in this position the upper tooth 106 of pawl 97 is rnoved adjacent to the ratchet wlxeel 98. Now as the sliding lever 12 returns towards the shntter housing to insert anolher slide frame 10 therein, pawl control lever 94 again rotates in a clocl wise direction (FIG. 30) so that toolh 106 on pawl 97 engages ratchet wheel 98 to turn it and interconnected indexing gear 92 so as to reverse the magazinc 9 on base 6. At the completion of its countcrclockwise movement, projection 107 on pawl control levcr 94 strikes thc reversing lever 99 (FIG. 31) to swing it upward to its normal forwnrd indcxing posilion ns dcscribed above so that solenoid 104 must be cncrgizcd auch timc that a revcrsc indexing is desirerl.

The reverse in(lcxing is conlrollcd by the above descrihed control bulton 37 or optionally by the rernote control button 89 0n remote control handle 84. As describcd above, cither of these buttons when depressed an initial amount, initiale a normal forward slide changing cycle. When further deprcssed, ci1her bulton operates a reverse cycle by closing reverse switch 79 or 90 respectively (FIG. 26). Thc reverse switch 79 connects voltage source 37 to solenoid 104 through contact switch 108. Switch 108 is positioned adiaccnt the shuttar honsing 13 so lhat it is closed by sliding lever 12 when sliding lever 12 is in its fully inserted posltion und when a framc 10 is fully inserted in projeclion position. This permits the operation of the rcversing means to initiale a reverse indexing bot thereafter deactivates the solcnoid 104 [o permit t'he return of the indcxing mcchanism to normal forward operation as described above.

The reversing switch contact 90 in thc remole coniro handle is c0nnecled in parallel with the local control reversing swilch 79 lo provide similar reversing action at the rcmotc control handle 84.

A preferrcd embodimenl of the solenoid control voltage sourcc 87 is illustraled in FIG. 26. This source uses the regular winding 110 of the projector motor 25 as a transformer primary and employs a low voltage secondary winding 111 which is coupled to the solenoids 8l and 104 through a rectifier 112 to provide them with W voltage D.C. energizing currcnt. This arrangement provides a convenient and compact source of low voltage so that only low harmless yoltages are used on the remote control handle and in the control wiring systems and so that the solenoid and switch contact lives are extended.

F ocusing The projector lens system 18 is mounted in from of the slide housing on a lens bracket 120 which is slideably mounted on the projector base 6. As illustrated in FIG. 19 the lens bracket 120 has a flat base po'rtion 121 with a flange 122 adapted to slide in a bracket positioning slot 123 formed in the projector base 6. The lower edge of the flange 122 has suitable ratchet teeth 124 adapted to be engaged by a pinion 125 mounted at one endof a horizontal focusing'shaft 126 as illustrated in FIG. 18. A focusing wheel 127 is mounted on the opposite and of the shaft with its upper portion protruding through the projector base 6 as illustrated in FIG. 2. Rotation of the focusing wheel 127 in the appropriate direction thus moves the lens bracket 120 and the Ions system 18 mounted therein toward or away from the slide 11 as desired to focus the projected picture.

As illustrated in FIGS. 23 the focusing wheel 127 is also used in a remote focusing system which permits' the focusing operation to be performed from a remote position by a focusing button 128 provided on a remote control handle 84 positioned at the and of the remote control cord. The remote control handle 84 is illustrated in FIG. 2 with the focusing control button 128 and with connecting wires 129 whose function is schematically illustrated in FIG. 20. Wires 129 are included in a suitable remote control cord 130 with the wiring for the above described control button 89 cf the slide changing system.

The remote focusing control comprises a ratchet system 131 with two pawls 132 and 133 mounted at the opposite ends of a pawl frame 134. The pawl frame 134 is slideably mounted adjacent. the bottom of the focusing wheel 127 on a suitable bracket 135 and is adaptable for sliding movement to bring one or the other cf the pawls 132 or 133 into contact with a tooth on the focusing wheel 127. Two solenoids 135 and 136 are provided with a common armature 137 connected to the pawl frame 134. The solenoids 135 and 136 are arranged so that each moves the armature in an opposite direction from the other. As illustrated in FIG. 20, the remote control focusing button 128 mounted in the remote control handle 82 is rotated in a clockwise direction to olose the upper contnct 139 of a switch 140 to thereby connect the first solenoid 135 to the voltage source 87 through lines 129 in the remote control cord 130. This causes the armature 137 to move to the left as illustrated in FIG. 21 bringing the right hand pawl 132 into engagement with a tooth 141 on the focusing wheel 127 whereby rolating the wheel 127 one step in a counterclockwise direction. When the focusing button is released the solenoid 135 is dc-energized permitting the pawl 132 to rcturn to its Center position under the force or' leaf 142 of the spring 143. As illustrated in FIG. 21, the pawl 132 is rota t ably mounted on the pawl frame 134 10 permit it to swing clear of the focusing wheel teeth against the force of a its return movement. l

The stop 144 on the pawl 132 engages the pawl frame 134 to hold the pawl in proper position to engage the focusing wheel 127.

Rotating of the focusing button 128 in the opposite direction energizes the solenoid 136 by connecting it to pawl spring on direction.

ture 137 to its central position when the focu'sing button voltage source 87 through contact 145 and wires 129. This moves the armature 137 to the right causing the focusing wheel 127 to be engaged by the opposite pawl 133 so that the focusing wheel 127 and the interconnected lens system 18 are moved one step in the opposite The leaf 146 of spring 143 returns the arma- 128 is released.

Thus it is Seen that the lens system 18 is moved in either direction as neccssary to sharply focus the pro jection'image by'rocking the focusing button in the proper direction the nccessary number of times. The movemcnt of the focusing button 128 in one direction or the other is seen to correspond in a general way 10 the relatcd movement of the lens so that the operator obtains the feel of the focusing action even though he is performing the focusing operation at a remote position. The spring members 147 mounted on the opposite sides of the flange 122 on the bracket 120 slideably engage the projector base 6 to provide a firm yet slideable positioning of the bracket 120 on the base 6. The lens system 18 is removably mounted in frame 120 by cooperating mounting pin 148, slot 149 and cam surfaces 150 as illustrated in FIGS. 4 and 37. A protective cover 151 is provided for the lens systern 18 which is automatically .swung into position when projector cover 5 is put on. Lug 152 on cover 5 engages one end 153 of the cover mounting arm 154 to swing cover 151 across lens opening 155 in housing 4 (FIG. 38).

S/zutter housing and slide editor opaque shutter 164 is pivotally mounted on pivot points 165 on the plate 162 so that the shutter plate 164 in its normal closed position is interposed between the aperture 163 in the plate 162 and the Ions system 18 to out olf the transmission of the projector light beam through lens system 18.

As each slide frame 10 is moved into the shutter housing 13 by the slide injection lever 7 the lower immer corner 166 of the frame 10 strikes the foot 167 of a pivotally mounted shutter opening arm 168 best illustrated in FIGS. 4 and 6. The movement of the lower corner 166 of the slide frame 10 against the foot 167 of the shutter arm 168 causes the upper edge of the arm 168 to be swung against a projecting portion 169 of the shutter mounting arm 170 so that the shutter 164 is rotated about its pivots and clear of the light beam to its open position as illustrated in FIG. 6 against the force of the shutter closing spring 171 which closes the shutter automatically each time that a frame 10 is withdrawn from the shutter housing 13.

In order to provide for the removal of a slide 11 from a frame 10 to permit replacement of the slide 11 during an ediling of the magazine contents, a slide editor 172 (FIG. 6) is preferably provided on the shutter housing 13. This slide editor 172 permits editing of the magazine 9 while it is in place on the projector and also permits the editing 10 be done immediately after the viewing of a slide 11 by providing access to the shutter housing 13 through an auxiliary editing cover 173 mounted on the opposite side of the projector housing 4 from the slide injection lever 7. As will also be seen from the following description, the slide editor 172 rnay also be used to insert individual slides 1.1 into the projector 1 for viewing without using a magazine. v

The slide editor 172 comprises a separate apertured editorplate 174 slideably mounted on the shutter housing 13 between a groove 175 in thc lower portion of the shutter housing and a cooperating groove 176 lormcd in the upper frame supporting channcl 161. Access is provided to the outer edge of the editor plale 174 by the pivotally mounted editor cover 173 which is swung downwardly from its normal closed position as illustrated in FIG. 4 to its open position as illustrated in FIG. 11 when it is desired to slide the editor plate 174 out of the housing 4 to expose a frame 10. A handle 178 is pivotally mounted on the onter edge of the editor plate 174 to facilitate its withdrawal outwardly frorn the shutter hansing 13 in the direction of the arrow as illustrated in FIG. 11 in slot 179 in editor cover 173. In Order to retain frame 10 on the slide editor platc 174 as the plate is drawn outwardly of the housing 4 the lower frame supporting channei 160 is attached to the editor plate 174 for removal therewith. The shutter arm 168 also is mountecl on the Editor plate 174 and it will be seen that the outward movement of the editor plate 174 draws the upper end of the arm 168 away from the shutter 164 permitting the shutter 164 to close under the force of the shutter spring 171 to out off the projector light beam during the editing operation.

In order to release the slide frame 10 frorn the hook 19 of the slide injection lever 7 a release spring 180 is mountecl on the bottom of the shntter housing 13. As illustrated in FIG. 13 the spring 180 is normally hold downwardly away from the hook 19 by the lower surface of the frame supporting channel 160 on the slide editor plate 174. When the plate 174 is withdrawn from the slidc housing 4 the interconnected channel 160 movcs with the plate 174 thereby releasing the spring 180 and permitting it 10 move upwardly as illustrated in FIG. 14 to raise the hook 19 clear of lhc recess 20 in the slide frame 10. The slide frame 10 is hold in place on the slide editor plate 174 during its rernoval by a slid: gripping spring 181 mounted on the slide editor plate 174 .as

illustrated in FIGS. 11 and 17. When the slide editor plate 174 is in its normal inserted position for regular viewing the slide gripping spring 181 is held backwardly out of the path of the slide frames 10 to permit their normal passage into and out of the viewing position by a carn 182 forrned at one side of the upper slide frame supporting channel 161 as illustrated in FIG. 16. When the slide editor plate 174 is withdrawn along the upper channel 161, the upper end 183 of the spring 181 slides oif the cam 182 causing the flange 184 on the spring 181 to engage the edge of the slide frame 10 20 draw it along with the moving slide editor plate 174.

In order to permit each slide frarne 10 to be drawn out the opposite side of the projector from the magazine 9 by editor plate 174, it is necessary to swing the pusher arm 24 from its normal position in the path of the slicle frame 10 I an outward position clear of the slide frames 10.

This is provided for by having the pusher arm 24 yieldably attachecl to the sliding arm 12 so that it may rock outwardly of the sliding arm 12 whcn the editor plate is drawn outwardly of the projector. The leading edge 160 (FIG. 7) of thc lower channel 160 engages a pivotally mounted cam 185 positioned for horizontal movement about a pivot 186 on the bottom of the .shutter housing .13. This cam 185 swings outwardly against the pusher arm 24 thereby swinging the pusher arm 24 clear of the frame as it moves past the pusher arm 24 on the editor plate 174.

It is desirable to prevent operation of ihe slide changing mechanism when the slide edilor plate 174 is in its outward position since this woulcl perrnit advancement of the magazine without the reinsertion of the slide frame 10 and also since the slide editor plate 174 in its outward position cannot receive the next slide frame 10 frorn the magazine 9. An interlock is therefore provicled to prevent operation of the slide changing mechanism when the slide editor is being used. A preferred form of this inter- 10 lock includizs a gencrally verticnl interlock bar 190 slideably mounled or1 thc shutler housing 13 and having a pinion 191 adjacent the cooler porlion (FIG. 15) coupled 1.0 the cnm slot 192 in the 'cdilor covcr 173. The cam slot 192 thus controls lhe vertical posilion of the interlock bar 190. The slot 192 is shaped so (hat the opening of the editor cover 173 drops the interlock bar 190 causing a hook 193 on ils lower und 10 engage a slot 194 in the sliding arm 12 preventing its movement und thus preventing operation 01 the transfer means as long as the editor cover 173 is open. The inclined portion of the slot which drops the interlock bar at the very first downward movement of the editor cover is illustrated at 195 in FIG. 11. Thus, Operation of the slide transfer means is prevented as soon as the first initial outward swing of the editor cover occurs.

lt is also desirable to limit the use'of the slide editor 172 so that its cover cannot be opened except when a sllde frame 10'is in position in the shutter housing 13. This prevents the accidental insertion of additional slides or slide frames into the projeclor which would interfere with the normal magazine operalion. This ls accomplished in the preferred embocliment of the projector by providing a latching spring'l96 (FIG. 5) on the housing l3which locks the editor cover 173 in its closed position as long as the sliding lever 12 is not in its fnlly inserted position. The cover 173 is locked in its closed position by a locking sind 197 atiached to the latching spring 196 and adapted to engage an aperture 198 in the above described interlock bar 190. In order to open the editor cover 173 it is necessary for the interlock bar 190 10 move downwardly under the control of the cam slot 192 as the editor cover Es swung open as described abovc. The stud 197 which engages the aperture 198 in the interlock bar 190 preVents this movemenl cxcept when the sliding lever 12 is in its fully insertecl position as illustratcd in FIG. 9 so that it engages the lowcr end of the locking spring and swings the spring and tl1e sind clear of the interlock bar.

Tims, the interlock bar operates as described above to prevent the opening of the slide editor cover except when a slide is in position in the shutter housing 13 and thereafter prevents the subsequent operation of the slide changing mechanism until the editor plate 174 has been reinserted to its normal operating position and the editor cover 173 closed.

Control panel In the preferred embodiment of the projector as illustrated in FIG. 2, lhe projector controls for local operation are assembled on a single conveniently positioned control panel 200. This panel extends along one edge of the projector 1 so (hat it is conveniently positioned adjacent to the slide magazine 9 and the slidc injection lever 7. All the necessary projector controls nre positioned 011 the panel 200. Thus, a projcctor elevation whecl 201 is mounted at the forward and of the control panel 200. As illustrated in FIG. 18, lhe elevation whccl 201 is coupled 10 a slideably mounted front support leg 202 through the intermedialion of pinion shaft 203 and rack 204 on the leg 202. The above described focusing wheel 127 is mounted bchind Ihr: elevation wheel 201 and an on-ofl switch 205 for lamp 14 is mounted behind focusing wheel 127.

The slide changing button 29 as weil as an inlerval control button 206 for an automatic timing systern as shown in my Patent N0. 2,915,840 are also mounred on the control panel 200. At the rear end of control panel 200, a leveling adjustment knob 207 is provided as also illustrated in detail in FIG. 39. Button 207 is thrcadedly connected to adjustable rear foot 208 to raise or lower it to adjust the level of the projector.

The control cord for the above described remote control handle 84 which provides for both remote slide changing and for remote focusing is detachably connected 10 the projector base 2 by plug 209 (FIG. 3).

1 1 lt will be seen that a novel, compact projector has been wided with means for providing both local and remote :ration and for including both forward and reverse 1ga2ifle operation from the remote location together :h a focus control'where it may be necessary to refocus projector after a slide is changed. These features vc been provided in a compact and reliable projector m which includes a unique electro-mechanical operan system with numerous interlocks and safety features ich prevent misuse of any of the controls and which :vent unintentional damage to the projector, to the in- 'idual slides, or to the magazine. T he projector also orporates a novel slide editing feature which permits mging or editing of the magazine while the magazine in its regular viewing position on the projector. The ie editor also permits the projector to be used to prot individual slides without the use of a magazine when sired. The above features have also been incorporated in present projector iri such a way that a simplified and )l proof control system is provided which cntralizes operating controls on a single convenient operating ael so that all projector functions are under the count observation and control of the operator. As various changes may be made in the form, construcn and arrangement cf the parts herein without departfrom the spirit and scope of the invention and without :rificing any of its advantages, it is to be understood that matter herein is to be interpreted as illustrative and t in a limting sense. Having thus described my invention, I claim: l. A slide changing device comprising the combination a base, a slide frame positioner located on said base, nagazine guide means on said base for slidably supporta slide magazine, a slide lever reciprocably mounted said base and having a slide injection lever mounted one end, said slide lever including means for attaching lever t0 slide frames in a magazine supported by said ide means for moving the slide frames along a first path and from the slide frame positioner, a pusher arm auntecl on the opposite end of said slide lever adapted for )vement therewith to engage slide frames for assuring :ir return along said first path to the magazine, said de frame positioner comprising a slide frame support, track for slidably supporting said slide frame support d adapted for being extended outwardly of the base in e with said first path and beyond said pusher bar and 'ay from the magazine guide means for providing for sliding movement cf said slide frame support in the direction of the fifst path away from the viewing position and the magazine, means for moving the pusher bar away from said track for permitting movement of the slide 4 5 frame support on said track, and means at the slide frame positioner for dctaching the slide injection lever from the slide frame upon movement of the slide frame support along said track.

2. The slide changing device as claimed in claiin 1 which further comprises a shutter movably mounted adjacent to said slide frame positioner, shutter activating means on said slide frame support having a slide frame engaging member for swinging said shutter to an open position upon the entrance of a slide frame onto said slide frame support along said first path by said slide lever, and said activating means being positioned for reclosing said shutter when said slide frame Support containing said slide frame .is thereafter moved outwardly of the projector along said track.

3. The slide changing device as claimed in claim 1 whioh further comprises an inter-lock positioned for engaging said track for preventing extension of said track when the slide injection lever is withdrawn from the slide frame positioner to be engaged by the slide injection lever when it has been moved inwardly to position a slide frarne in said slide frame positioner to thereby release said track permitting its extension outwardly 0f the slide changing device base.

4. The slide changing device as claimed in claim 3 in which said inter-lock further comprises means for preventing movernent of the slide injection lever when the track is in its extended position.

References Cited by the Examiner UNITED STATES PATENTS 2,008020 7/1935 Jackman 88-24 2614,458 10/1952 Critoph et al. 8826 2874497 2/1959 Hulf et a1 88-28 X 2,915840 12/1959 Wilklund 40-79 2927,504 3/1960 Smith 88-26 2 ,979987 4/1961 Brumley et al. 88-28 3014297 12/1961 Robinson 40-79 3,067650 12/1962 Fester 4079 X EUGENE R. CAPOZIO, Primary Examiner.

E. s. ANDERSON, G. Y. CUSTER, JEROME SCHNALL, Examilzers 

1. A SLIDE CHANGING DEVICE COMPRISING THE COMBINATION OF A BASE, A SLIDE FRAME POSITIONER LOCATED ON SAID BASE, A MAGAZING GUIDE MEANS ON SAID BASE FOR SLIDABLY SUPPORTING A SLIDE MAGAZINE, A SLIDE LEVER RECIPROCABLY MOUNTED ON SAID BASE AND HAVING A SLIDE INJECTION LEVER MOUNTED AT ONE END, SAID SLIDE LEVER INCLUDING MEANS FOR ATTACHING THE LEVER TO SLIDE FRAMES IN A MAGAZINE SUPPORTED BY SAID GUIDE MEANS FOR MOVING THE SLIDE FRAMES ALONG A FIRST PATH TO AND FROM THE SLIDE FRAME POSITIONER, A PUSHER ARM MOUNTED ON THE OPPOSITE END OF SAID SLIDE LEVER ADAPTED FOR MOVEMENT THEREWITH TO ENGAGE SLIDE FRAMES FOR ASSURING THEIR RETURN ALONG SAID FIRST PATH TO THE MAGAZINE, SAID SLIDE FRAME POSITIONER COMPRISING A SLIDE FRAME SUPPORT, A TRACK FOR SLIDABLY SUPPORTING SAID SLIDE FRAME SUPPORT AND ADAPTED FOR BEING EXTENDED OUTWARDLY OF THE BASE IN LINE WITH SAID FIRST PATH AND BEYOND SAID PUSHER BAR AND AWAY FROM THE MAGAZINE GUIDE MEANS FOR PROVIDING FOR SLIDING MOVEMENT OF SAID SLIDE FRAME SUPPORT IN THE DIRECTION OF THE FIRST PATH AWAY FROM THE VIEWING POSITION AND THE MAGAZINE, MEANS FOR MOVING THE PUSHER BAR AWY FROM SAID TRACK FOR PERMITTING MOVEMENT OF THE SLIDE FRAME SUPPORT ON SAID TRACK, AND MEANS AT THE SLIDE FRAME POSITIONER FOR DETACHING THE SLIDE INJECTION LEVER FROM THE SLIDE FRAME UPON MOVEMENT OF THE SLIDE FRAME SUPPORT ALONG SAID TRACK. 